US20070118230A1 - Adjustable bone prostheses and related methods related applications - Google Patents
Adjustable bone prostheses and related methods related applications Download PDFInfo
- Publication number
- US20070118230A1 US20070118230A1 US11/656,285 US65628507A US2007118230A1 US 20070118230 A1 US20070118230 A1 US 20070118230A1 US 65628507 A US65628507 A US 65628507A US 2007118230 A1 US2007118230 A1 US 2007118230A1
- Authority
- US
- United States
- Prior art keywords
- mounting
- head
- mount
- stem
- ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/40—Joints for shoulders
- A61F2/4014—Humeral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic humeral shafts
-
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
- A61F2/4684—Trial or dummy prostheses
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C11/00—Pivots; Pivotal connections
- F16C11/04—Pivotal connections
- F16C11/06—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints
- F16C11/0661—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints the two co-operative parts each having both convex and concave interfaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C11/00—Pivots; Pivotal connections
- F16C11/04—Pivotal connections
- F16C11/10—Arrangements for locking
- F16C11/103—Arrangements for locking frictionally clamped
- F16C11/106—Arrangements for locking frictionally clamped for ball joints
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon Stands for scientific apparatus such as gravitational force meters
- F16M11/02—Heads
- F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
- F16M11/06—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting
- F16M11/12—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting in more than one direction
- F16M11/14—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting in more than one direction with ball-joint
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- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
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- A61F2002/30378—Spherically-shaped protrusion and recess
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- A61F2/02—Prostheses implantable into the body
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- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30405—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by screwing complementary threads machined on the parts themselves
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- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30433—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61F2002/30476—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism
- A61F2002/30507—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism using a threaded locking member, e.g. a locking screw or a set screw
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
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- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/40—Joints for shoulders
- A61F2/4059—Humeral shafts
- A61F2002/4062—Proximal or metaphyseal parts of shafts
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
- A61F2/4637—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for connecting or disconnecting two parts of a prosthesis
- A61F2002/4638—Tools for performing screwing, e.g. nut or screwdrivers, or particular adaptations therefor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
- A61F2002/4681—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor by applying mechanical shocks, e.g. by hammering
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2220/0033—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2220/0041—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels or rivets, e.g. connecting screws
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0004—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof adjustable
- A61F2250/0006—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof adjustable for adjusting angular orientation
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0004—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof adjustable
- A61F2250/0008—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof adjustable for adjusting a position by translation along an axis or two perpendicular axes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0058—Additional features; Implant or prostheses properties not otherwise provided for
- A61F2250/006—Additional features; Implant or prostheses properties not otherwise provided for modular
- A61F2250/0063—Nested prosthetic parts
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0058—Additional features; Implant or prostheses properties not otherwise provided for
- A61F2250/0096—Markers and sensors for detecting a position or changes of a position of an implant, e.g. RF sensors, ultrasound markers
- A61F2250/0097—Visible markings, e.g. indicia
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00011—Metals or alloys
- A61F2310/00017—Iron- or Fe-based alloys, e.g. stainless steel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T403/00—Joints and connections
- Y10T403/32—Articulated members
- Y10T403/32606—Pivoted
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T403/00—Joints and connections
- Y10T403/32—Articulated members
- Y10T403/32606—Pivoted
- Y10T403/32622—Rocking or rolling contact
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T403/00—Joints and connections
- Y10T403/32—Articulated members
- Y10T403/32606—Pivoted
- Y10T403/32631—Universal ball and socket
- Y10T403/32639—Universal ball and socket including internal tie means
Abstract
Adjustable prostheses and related methods provide a wide range of adjustment along or about multiple axes. The prostheses and related methods make possible a straightforward, yet robust way of securing, e.g., a humeral head prosthesis in a desired position and maintaining the prosthesis in the desired position during use.
Description
- This application is a divisional of co-pending U.S. application Ser. No. 10/767,673, filed Jan. 29, 2004, which is a divisional of U.S. application Ser. No. 10/041,722, filed Jan. 8, 2002 (now U.S. Pat. No. 6,736,852), which claims the benefit of provisional Application Ser. No. 60/271,895, filed Feb. 27, 2001, entitled “Adjustable Head Prosthesis for the Shoulder.”
- This invention generally relates to an adjustable mounting assembly and alignment system for a bone prosthesis and related methods.
- A shoulder joint consists of a ball-and-socket type coupling of the humerus to the scapula. The humerus forms the ball, and the socket is formed at the glenoid cavity of the scapula. Injury or disease to the joint often results in destruction or deterioration of the head of the humerus, leading to pain and a corresponding loss of mobility and function. In such cases, it is often necessary to provide a replacement joint surface, i.e., a prosthesis, for the head of the humerus that mates with the glenoid cavity.
- The proper alignment of the prosthesis is generally useful to effective performance of the replacement procedure. Typically, the position of the mount is adjusted until the desired position is achieved. The mount is fixed in the desired position and the prosthesis is then secured onto the mount.
- However, conventional mounts provide only a limited range of adjustment, typically allowing only two degrees of freedom, i.e., linearly along an X-axis and Y-axis. The devices that do have more degrees of freedom require multiple trials and a fixture to be used away from the surgical site for proper alignment of the prosthesis to the humerus.
- Further, even upon locking the device in a desired position, conventional mounts may not hold the desired position. This is especially true when force is exerted, e.g., hammering the prosthesis to secure its placement on a mount.
- There remains a need for mounting systems and methods that permit a wide range of adjustment of a humeral head prosthesis while enabling the mount, and attached prosthesis, to remain securely fixed in a desired position.
- The invention provides various adjustable prostheses and related methods that provide a wide range of adjustment along or about multiple axes. The invention makes possible a straightforward, yet robust way of securing, e.g., a humeral head prosthesis in a desired position and maintaining the prosthesis in the desired position during use.
- Other features and advantages of the inventions are set forth in the following specification and attached drawings.
-
FIG. 1 is an exploded view of the components of an adjustable locking mount system that embodies features of the invention, in which the mounting hub is centric. -
FIG. 2 is an assembled perspective view of the system shown inFIG. 1 . -
FIG. 3 a is a side sectional view of the assembled components of the system shown inFIG. 2 . -
FIG. 3 b is a view similar toFIG. 3 a and illustrating the spherical radii of the stacked washers. -
FIGS. 4 a-4 e illustrate rotational movement of the cooperating components of the assembled system shown inFIG. 2 . -
FIG. 5 a is a side sectional view of the assembled components of the system shown inFIG. 3 and illustrating the system components in a level position. -
FIG. 5 b is a sectional view as shown inFIG. 5 a, illustrating the position of the system components and the movement of the mounting hub and lock washer when the mounting hub is rotated about the x or y axis. -
FIG. 5 c is a sectional view as shown inFIG. 5 b, illustrating the procedure of locking the system in a desired position. -
FIG. 6 is an exploded view of the components of an alternative embodiment of an adjustable locking mount system that embodies features of the invention, in which the mounting hub is eccentric. -
FIG. 7 is an assembled perspective view of the system shown inFIG. 6 . -
FIG. 8 is side sectional view of the assembled components of the system shown inFIG. 7 . -
FIGS. 9 a-9 e illustrate rotational movement of the cooperating components of the assembled system shown inFIG. 7 . -
FIG. 10 is an exploded view of an adjustable locking mount system embodying features of the invention incorporated in a shoulder replacement assembly. -
FIG. 11 is a perspective view of the assembled components of the system shown inFIG. 10 . -
FIG. 12 a is an enlarged perspective view of the top portion of the trial ring shown inFIG. 10 . -
FIG. 12 b is an enlarged perspective view of the bottom portion of the trial ring shown inFIG. 10 . -
FIG. 13 a is an enlarged perspective view of the top portion of the artificial head shown inFIG. 10 . -
FIG. 13 b is an enlarged perspective view of the bottom portion of the artificial head shown inFIG. 10 , and further illustrating the interior surface of the artificial head. -
FIG. 14 a is an exploded view of the components of an alternate embodiment of a shoulder replacement system embodying features of the invention and viewed from the head to the stem. -
FIG. 14 b is a view similar toFIG. 14 a and viewed from the stem to the head. -
FIG. 15 is a view similar toFIGS. 14 a and 14 b and illustrating a partially assembled view of the system components. -
FIG. 16 is a perspective view of a humerus bone, with a line representing a cut in the ball portion of the humerus made during shoulder replacement surgery. -
FIG. 17 illustrates a humerus as shown inFIG. 16 , illustrating the head cut and removed from the humerus and a bore reamed into the bone. -
FIG. 18 is a perspective view illustrating a humerus as shown inFIG. 17 , and further illustrating the insertion into the bore of a stem carrying an adjustable mount of the present invention. -
FIGS. 19 a and 19 b are perspective views illustrating a humerus as shown inFIG. 18 , and further illustrating a trial ring engaging the mount and being rotated simultaneously with the mount. -
FIG. 19 c illustrates the trial being and the mount rotated independently of each other. -
FIG. 20 illustrates a humerus as shown inFIGS. 19 a and 19 b, illustrating the trial ring being simultaneously tilted with the mount. -
FIG. 21 illustrates a humerus as shown inFIG. 20 , and further illustrates the procedure of locking the mount in a desired position. -
FIG. 22 shows a humerus as inFIG. 21 , with the trial ring removed and illustrating the placement of an artificial head onto the mount. -
FIG. 23 illustrates a humerus as shown inFIG. 22 , with the artificial head placed on the mount and further illustrating the use of a hammer to secure the artificial head on the mount. -
FIG. 24 a is an exploded view of the components of an alternative embodiment of a shoulder replacement system embodying features of the invention and viewed from the head to the stem. -
FIG. 24 b is a view similar toFIG. 24 a and viewed from the stem to the head. -
FIG. 25 is a view similar toFIGS. 24 a and 24 b and illustrating the use and placement of the pivot pin component of the system to secure the bottom insert component onto the stem component. -
FIG. 26 is a view similar toFIG. 25 and illustrating the placement of the eccentric mount component onto the bottom insert component. -
FIGS. 27 a-27 e are partially assembled views of the system shown inFIGS. 24 a and 24 b and illustrating rotational movement of the partially assembled system. -
FIG. 28 is a partially assembled view of the system shown inFIGS. 24 a and 24 b and illustrating the placement of the top insert on the bottom insert. -
FIG. 29 is a perspective view of the components of the system shown in 24 a and 24 b assembled. -
FIG. 30 a is an exploded view of the components of an alternative embodiment of a shoulder replacement system embodying features of the invention and viewed from the head to the stem. -
FIG. 30 b is view similar toFIG. 30 a and viewed from the stem to the head. -
FIG. 31 is a view similar toFIGS. 30 a and 30 b illustrating the use of the pivot pin component to secure the mounting ring and the bottom disk to the stem. -
FIG. 32 is a view similar toFIG. 31 and illustrating the placement of the top disc on the bottom disk. -
FIGS. 33 a-33 e are views similar toFIG. 32 and illustrating the placement of the head component onto the mounting ring component and further illustrating the rotational movement of the assembled system. -
FIG. 34 is a view similar toFIGS. 33 a-33 e and illustrating the locking of the assembled system in a desired position. -
FIG. 35 a is an exploded view of an alternative embodiment of a shoulder replacement system embodying features of the invention viewed from the head to the stem. -
FIG. 35 b is a view similar toFIG. 35 a and viewed from the stem to the head. -
FIG. 36 is an exploded view of the bottom and top plate components of the system shown inFIGS. 35 a and 35 b and illustrating the major and minor axes of the top and bottom plates. -
FIG. 37 is a partially assembled view of the system shown inFIGS. 35 a and 35 b and illustrating the use of the pivot pin to secure the placement of the bottom plate onto to stem. -
FIG. 38 is a view similar toFIG. 37 and illustrating the placement of the top plate on the bottom plate. -
FIGS. 39 a-39 e are views similar toFIG. 38 and illustrating rotational movement of the partially assembled system. -
FIG. 40 is an assembled view of the system shown inFIGS. 35 a and 35 b. - The invention may be embodied in several forms without departing from its spirit or essential characteristics. The scope of the invention is defined in the appended claims, rather than in the specific description preceding them. All embodiments that fall within the meaning and range of equivalency of the claims are therefore intended to be embraced by the claims.
- Although the disclosure hereof is detailed and exact to enable those skilled in the art to practice the invention, the physical embodiments herein disclosed merely exemplify the invention that may be embodied in other specific structure. While the preferred embodiment has been described, the details may be changed without departing from the invention, which is defined by the claims.
- I. The Adjustable Locking Mount System
- A. System 1:
-
- Interior Hub Centrally Located with Respect to Mounting Surface
-
FIG. 1 shows the individual components of an adjustable locking mounting system 10A.FIGS. 2 and 3 a illustrate the system 10A when assembled. As will be described in detail later, the system 10A permits adjustment in three directions or three degrees of freedom (rotational around axes x, y, and z, where the z-axis is represented by the axis of the pivot pin 12) (seeFIGS. 4 a-4 e). - The system 10A comprises the
pivot pin 12, at least oneslip washer 14, at least onelock washer 16, a mountinghub 18, and a lockingscrew 20. Each of these components of the system 10A will now be described in detail. - 1. System Components
- As seen in
FIG. 1 , thepivot pin 12 is a rigid, generally cylindrical or rod-like member. Thepivot pin 12 is convex, e.g., domed, at one end to couple with the mounting hub 18 (see, e.g.,FIG. 3 a). In a representative embodiment, the arc of curvature is 0.400″ diameter (0.200″ radius). - In particular, the convex arrangement permits adjustment of the mounting
hub 18 by swinging or tilting across the axis of the pivot pin 12 (i.e., rotation about the x-axis and y-axis) as well as by rotating or twisting about the axis of the pivot pin 12 (i.e., rotation about the z-axis) (seeFIGS. 4 a-4 e). - As best seen in
FIGS. 1 and 3 , thepivot pin 12 has a threadedcentral bore 26 that serves to receive the lockingscrew 20. Thus, thepivot pin 12 serves to receive both the mountinghub 18 and the locking screw 20 (seeFIG. 3 a). - The
pivot pin 12 can be made of suitable metal, plastic, or ceramic materials and formed by conventional molding or machining techniques. - As shown in
FIG. 1 , the mountinghub 18 is a rigid member comprising a mountingsurface 24, aninterior hub 22, and anexterior pivot surface 28. The center of the mountinghub 18 serves to receive the lockingscrew 20. - The mounting
surface 24 is configured to mate with an object or device being mounted on the hub and therefore can take on a variety of shapes. Thus, the mountinghub 18 serves as a base for mounting of another object or device. For example, the mountingsurface 24 can be circular or geometric. In the illustrated embodiment, the mountingsurface 24 is generally circular. - Additionally, the mounting
surface 24 can be stepped to further aid in positioning and securing the object or device on the mounting surface 24 (not shown). In this arrangement, the object or device being mounted would have a complementary stepped surface. The stepped surface provides greater control of any adjustment by permitting adjustment to be in uniform increments and reducing the risk of inadvertent movement. The mountingsurface 24 could alternatively be a threaded surface to facilitate engagement with a mating part. - As best illustrated in
FIG. 1 , theinterior hub 22 is open. The bottom surface of theinterior hub 22 is configured to conform to the shape of the convex end of thepivot pin 12 and sized to receive the slip washer(s) 14 and lock washer(s) 16. That is, theinterior hub 22 permits aslip washer 14 andlock washer 16, ormultiple slip washers 14 and lockwashers 16, to be alternately stacked upon one another (seeFIG. 3 a). - As shown in
FIGS. 1-3 a, theexterior pivot surface 28 of the mountinghub 18 is configured to nest on and to conform to the convex end of thepivot pin 12, thus permitting a wider range of motion, as previously described. - As best seen in
FIG. 3 a, theexterior pivot surface 28 is located centrally with respect to theinterior hub 22. Further, theinterior hub 22 is centrally located with respect to the mountingsurface 24, such that the geometric center of the mountinghub 18 coincides with the center of rotation of the mountinghub 18 about thepivot pin 12. - The mounting
hub 18 serves to engage and pivot about thepivot pin 12, thus permitting adjustment of the position of the mountinghub 18 with respect to thepivot pin 12, as will be described later. Upon obtaining the desired position, the position of the mountinghub 18 can be locked by use of the lockingscrew 20, as will also be described in greater detail later. - The mounting
hub 18 can be made of any suitable metal or plastic and formed by conventional machining or molding techniques. - As shown in
FIG. 1 , the system 10A also provides at least oneslip washer 14. Theslip washer 14 is preferably a rigid annular ring or doughnut-like member. AsFIGS. 1 and 3 a best show, theslip washer 14 is configured to conform to the bottom surface of theinterior hub 22. - The center of the
slip washer 14 serves to receive the lockingscrew 20. The center of theslip washer 14 is of a diameter only slightly larger than the outside diameter of the lockingscrew 20. Theslip washer 14 also serves to provide a frictional surface, which upon tightening of the lockingscrew 20, serves to further secure the mountinghub 18 in a desired position. - The
slip washer 14 permits thelock washer 16 to slide across the surface of the slip washer 14 (seeFIGS. 5 a and 5 b). Theslip washer 14 is similar in function yet physically different in top and bottom spherical radii from thelock washer 16. - As seen in
FIG. 3 b,additional washers FIG. 3 b, as they are stacked further from the center of rotation or pivot point on thepivot pin 12. In a representative embodiment, R1 is 0.200, R2 is 0.250, R3 is 0.300, R4 is 0.350, and R5 is 0.400. - The radii of the
washers individual washers washers washers - Desirably, as illustrated in
FIGS. 1 and 3 a, asecond slip washer 14, similar in function but differing in spherical radii from thefirst slip washer 14 is placed over thelock washer 16. As illustrated inFIGS. 5 a and 5 b, thelock washer 16 is able to slide between theslip washers 14. - In this arrangement, the
second slip washer 14 provides an additional frictional surface, which upon tightening of the lockingscrew 20, serves to further secure the desired position. - The slip washer(s) 14 can be made of any suitable metal or plastic and formed by conventional machining or molding techniques.
- As also seen in
FIG. 1 , the system 10A further provides alock washer 16. Thelock washer 16 is a rigid, annular ring or doughnut-like member similar to theslip washer 14. - As
FIGS. 1 and 3 a best illustrate, thelock washer 16 is configured to conform to the surface of theslip washer 14. This arrangement permits thelock washer 16 to be stacked on top of theslip washer 14. - As in the case of the
slip washer 14, the center of thelock washer 16 serves to receive the lockingscrew 20. The center of thelock washer 16 is also sized larger than the center of theslip washer 14. That is, the center of thelock washer 16 not only serves to receive the lockingscrew 20, but also permits thelock washer 16 to pivot about thepivot pin 12. - The
lock washer 16 also provides two additional frictional surfaces when sandwiched between twoslip washers 14, which upon tightening of the lockingscrew 20, serve to further secure the desired position. - As also seen in
FIGS. 1 and 3 a, thelock washer 16 is of a larger diameter than theslip washer 14. This arrangement allows thelock washer 16 to fit over theslip washer 14. In a representative embodiment, thelock washer 16 is sized to approximate or be slightly less than the diameter of theinterior hub 22, thereby providing a secure fit of thelock washer 16 within theinterior hub 22 and allowing only minimal translation in the x and y axes, yet not restricting z-axis translation of thelock washer 16 within theinterior hub 22 and with respect to the axis of thepivot pin 12, as will later be described in detail. - This arrangement secures/couples the
lock washer 16 to theinterior hub 22 and permits thelock washer 16 to slide with the mountinghub 18 over the slip washer 14 (see, e.g.,FIGS. 5 a and 5 b). Thus, thelock washer 16 serves to provide an additional rotational and rocking surface for the mountinghub 18. - Like the
slip washer 14, thelock washer 16 can be made of any suitable plastic or metal and formed by conventional molding or machining techniques. - Desirably, as previously noted, a
second slip washer 14 similar in function but differing in spherical radii from thefirst slip washer 14 can be provided. In this arrangement, as seen inFIGS. 1 and 3 a, thelock washer 16 also serves to receive thesecond slip washer 14. It will be apparent that any number ofslip washers 14 and lockwashers 16 can be similarly alternately stacked upon each other and thereby accommodate variations in the depth of theinterior hub 22. - As also shown in
FIG. 1 , the system 10A provides a lockingscrew 20. The lockingscrew 20 is a screw that is adapted for passage through the mountinghub 18, the slip washer(s) 14, the lock washer(s) 16, and thepivot pin 12 when the system is assembled (seeFIG. 3 a). In inside the diameter of theslip washer 14 is sized to approximate or be slightly larger than the diameter of the lockingscrew 20. This arrangement secures/couples theslip washer 14 to the lockingscrew 20 and thepivot pin 12. - As illustrated in
FIG. 3 a, the lockingscrew 20 is desirably threaded to fit the threaded bore 26 of thepivot pin 12. AsFIG. 5 c illustrates, rotation (represented by arrow inFIG. 5 c) of thescrew 20, e.g., by anAllen wrench 30, advances the screw into thepivot pin 12 to fix the mountinghub 18 in a desired position. - The locking
screw 20 can be made of any suitable plastic or metal and formed by conventional molding or machining techniques. - The locking
screw 20, when not fully tightened, serves to hold the assembly while the desired position is determined. Tightening of the lockingscrew 20 compresses thewashers hub 18, and pin 12 together, thereby creating multiple frictional forces between the mating surfaces. These frictional forces and the compression of thescrew 20 are what limit movement in the locked position. - It will be apparent that the components just described can be used in any combination. For example,
plastic slip washers 14 may be alternated withmetal lock washers 16. - 2. Adjustment of the Orientation of the Mounting Hub
- The system 10A as previously described enables the mounting
hub 18 to be oriented in a variety of directions with respect to thepivot pin 12. The types of movement, and thus the types of adjustments permitted, will now be discussed. - The system 10A permits movement of the mounting
hub 18 in at least three rotational directions. - First, as represented by arrows in
FIGS. 4 a-4 b, the mountinghub 18 can be rocked or rotated, i.e., tilted, about the x-axis (i.e., side to side rotation). This motion is permitted by the convex surfaces of thepivot pin 12, mountinghub 18, slip washer(s) 14, and lock washer(s) 16. - Second, as represented arrows in
FIGS. 4 c-4 d, the mountinghub 18 can be rocked or rotated, i.e., tilted, about the y-axis (i.e., front to back rotation). This motion is permitted by the convex surfaces of thepivot pin 12, mountinghub 18, slip washer(s) 14, and lock washer(s) 16. - Third, as represented by arrows in
FIG. 4 e, the mountinghub 18 can be rotated 360° in either a clockwise or counterclockwise direction about the z-axis (i.e., axis of the pivot pin 12). - It is to be understood that the rotational and rocking movements permit adjustment in virtually an infinite number of rotational directions.
- B. System 2:
-
- Interior Hub Eccentrally Located with Respect to Mounting Surface
- 1. System Components
-
FIG. 6 shows the individual components of an alternative system 10B providing an adjustable locking mount system.FIGS. 7 and 8 illustrate the system 10B when assembled. - Like system 10A, the system 10B comprises a
pivot pin 12, at least oneslip washer 14, at least onelock washer 16, a mountinghub 18, and a lockingscrew 20. - Also like system 10A, the mounting
hub 18 has anexterior pivot surface 28 that is located centrally with respect to theinterior hub 22. In this embodiment, asFIGS. 6-8 best show, theinterior hub 22 is eccentric with respect to the mountingsurface 24, such that the geometric center of the mountinghub 18 does not coincide with the center of rotation of the mountinghub 18 about thepivot pin 12. The eccentric configuration permits a broader range of adjustment. -
- 2. Adjustment of the Orientation of the Mounting Hub
- The system 10B as previously described enables the mounting
hub 18 to be oriented in a variety of directions with respect to thepivot pin 12. The types of movement, and thus the types of adjustments permitted, will now be discussed. - The system 10B permits movement of the mounting
hub 18 in at least five directions. - First, as represented by arrows in
FIGS. 9 a-9 b, the mountinghub 18 can be rocked or rotated about the x-axis, as previously described for system 10A. - Second, as represented by arrows in
FIGS. 9 c-9 d, the mountinghub 18 can be rocked or rotated about the y-axis, as also previously described for system 10A. - Third, as represented by arrows in
FIG. 9 e, the mountinghub 18 can be rotated up to 360° in either direction about the z-axis, as previously described for system 10A. - As best illustrated in
FIGS. 7 and 8 , when the mountinghub 18 includes aninterior hub 22 that is eccentric relative to the mountingsurface 24, the distance from thepivot pin 12 to the mountingsurface 24 increases to a maximum value, depicted as point A1 and then decreases to a minimum value, depicted as point A2. - Reorientation or translation of the linear position of point A1 and point A2 with respect to the
pivot pin 12 is possible when the mountinghub 18 is rotated about the z-axis. - Reorientation of points A1 and A2 with respect to the x-axis provides a fourth degree of freedom. Similarly, reorientation of points A1 and A2 with respect to the y-axis provides a fifth degree of freedom.
- It is to be understood that the rotational and rocking movements just described permit adjustment in virtually an infinite number of directions.
- After the desired position is obtained, the locking
screw 20 is tightened to secure the mountinghub 18 in the desired position, as previously described for System 10A (seeFIG. 5 c). - II. Use of the System in Shoulder Replacement
-
FIGS. 10-23 detail the use of either of the previously-described systems 10A or 10B in shoulder replacement surgery. Desirably, system 10B would be employed, thereby providing the greatest range of adjustment. In the embodiment illustrated inFIGS. 10-23 , the mount of system 10B is employed. - The long bone of the upper or proximal arm, as shown in
FIG. 16 , is known as thehumerus 38. The proximal end of thehumerus 38 comprises a ball-shapedhead 40 that normally nests within the glenoid cavity of the shoulder bone, or scapula. - Through disease or injury, the
head 40 of thehumerus 38 can become damaged such that the shape of thehead 40 is altered or thehead 40 does not fit properly within the glenoid cavity. Such damage typically results in the shoulder joint becoming painful and a corresponding reduction in mobility of the joint. - Conventional techniques provide for replacement of the
head 40 of thehumerus 38 with a prosthesis, orartifical head 42. As seen inFIG. 10 , the system 10B, comprising apivot pin 12, a mounting hub 18 (with eccentrally located interior hub 22), slipwashers 14, alock washer 16, and a lockingscrew 20, can be employed within ashoulder replacement assembly 44 suitable for implantation into ahumerus 38. The system 10B would permit a physician to mount, position, and secure anartificial head 42. - As shown in
FIG. 10 , the replacement assembly comprises astem 46 including tendon attachment holes 50, an assembled system 10B implanted within thestem 46, atrial ring 48, and anartificial head 42.FIG. 11 illustrates thereplacement assembly 44 in assembled form. - The
stem 46 is aconventional stem 46 suitable for implantation within ahumerus 38. Thestem 46 desirably includes tendon attachment holes 50 that serve to secure attachment of tendons (not shown) to thestem 46. - The
stem 46 serves to hold the system 10B. That is, thepivot pin 12 is implanted within thestem 46 such that the convex portion protrudes at a pre-selected angle from the stem 46 (e.g., 35°). - The
pivot pin 12 can be implanted within thestem 46 by various techniques. In one embodiment, thepin 12 is integrally molded with thestem 46. Alternatively, thepin 12 can be a separate member configured to mate with an existingstem 46. In a representative embodiment, thepin 12 includes a Morse taper, as seen inFIG. 10 , configured to mate with a complementary tapered surface within thestem 46. In yet another embodiment, thepin 12 is configured to mate with thestem 46 by threaded engagement (not shown). - As also shown in
FIG. 10 , atrial ring 48 is desirably provided. Thetrial ring 48 is a rigid, generally ring-like member having aninner surface 52 and anouter surface 54. Theinner surface 52 is desirably eccentric relative to theouter surface 54. Thetrial ring 48 can be made of plastic or any other suitable material. - The
trial ring 48 is adapted to mate with the mountinghub 18, i.e., the trial ring's 48inner surface 52 geometry approximates the geometry of the mountingsurface 24. In the embodiment illustrated inFIG. 10 , the mountingsurface 24 is circular and conically tapered and thetrial ring 48 has aninner surface 52 that is complementary circular and tapered. - Optionally, the
inner surface 52 of the trial ring can be of a geometric or stepped formation adapted to mate with a complementary surface on the mountingsurface 24, as previously described (not shown). - As shown in
FIG. 12 a, theouter surface 54 of thetrial ring 48 desirably hasreference markers 56, e.g., A, B, C, and D, spaced circumferentially around theouter surface 54. - Optionally, as also seen in
FIG. 12 a, theouter surface 54 is tapered or radiused outward toward the bottom of thetrial ring 48 for better visualization of themarkers 56. - In the embodiment illustrated in
FIGS. 12 a and 12 b, theouter surface 54 of thetrial ring 48 containsknurls 58. Theknurls 58 provide for easier grasping of thetrial ring 48. Optionally, theouter surface 54 does not containknurls 58 or theouter surface 54 is otherwise adapted for grasping (not shown). Theoutside diameter 57 of thetrial ring 48 corresponds or is equivalent to the outside diameter of thehumeral head 42. - The
trial ring 48 is adapted to engage the mountinghub 18 and pivot simultaneously with the mountinghub 18. In this arrangement, thereference markers 56 can be utilized for evaluation and recording of the desired position, as will be described in greater detail later. - As seen in
FIG. 10 , anartificial head 42 is also provided. Theartificial head 42 is a rigid, dome-likemember having interior 60 and exterior surfaces 62. Theartificial head 42 can be made of stainless steel or other suitable materials. - As best illustrated in
FIGS. 11 and 13 a, theexterior surface 62 is domed to mimic the ball-like head 40 of thehumerus 38. - As seen in
FIG. 13 b, theinterior surface 60 is recessed and adapted to mate with the mountingsurface 24. In the embodiment illustrated inFIG. 13 b, theinner surface 60 is circular. Optionally, theinterior surface 60 can be stepped to mate with a complementary mountingsurface 24, as previously described (not shown). - As
FIG. 13 b also shows, theinterior surface 60 desirably hasreference markers 56′ that are complementary to, i.e., mirror, thereference markers 56 on thetrial ring 48. This assures that, whencomplementary markers trial ring 48 and theartificial head 42 are similarly orientated with respect to the mountinghub 18, the position of theartificial head 42 will be the same as the position of thetrial ring 48, as will be explained in greater detail later. - Desirably, as in the embodiment illustrated in
FIG. 13 b, the recessedinner surface 60 of theartificial head 42 is eccentrally located with respect to theouter surface 62. - When used in combination with the eccentrally located
interior hub 22 of system 10B, this arrangement provides a “double-eccentric” system. The double-eccentric configuration provides a maximum range of adjustment from O axes offset to up to the maximum axes offset. - In an alternate embodiment, shown in
FIGS. 14 a-14 b and 15, theinner surface 60 of theartificial head 42 is centrally located with respect to theouter surface 62. In this arrangement, anintermediate collar 63 having aninterior surface 59 and anexterior surface 61 can be provided. - The
interior surface 59 of thecollar 63 is eccentrally located with respect to theexterior surface 61 and configured to mate with the mountingsurface 24. Theexterior surface 61 is desirably configured to mate with theinterior surface 60 of theartificial head 42. This arrangement also results in a double-eccentric configuration. - In use, as seen in
FIG. 16 , the physician makes acut 65 through thehead 40 of thehumerus 38 by conventional techniques. Next, as shown inFIG. 17 , aninterior bore 64 is reamed in thehumerus 38 by conventional techniques to prepare the bone for receiving thestem 46. - The
stem 46, incorporating the system 10B, is then inserted within thebore 64, as shown inFIG. 18 . Tendons can then be attached to thestem 46 using the tendon attachment holes 50 (not shown). - The
trial ring 48 is then placed on the mountinghub 18. The eccentricinterior hub 22 of the mountinghub 18, together with the eccentric inner surface of thetrial ring 48 form a double-eccentric system, as shown inFIGS. 19 a-19 c. As represented by arrows inFIGS. 19 a and 19 b, thetrial ring 48 is then rotated simultaneously with the mountinghub 18 until the desired position relative to the cut surface of thehumerus 38 is achieved (e.g., center oftrial ring 48 is centered with cut surface of humerus 38). - As
FIG. 19 c shows, thetrial ring 48 is also adapted to rotate independently of the mountinghub 18. - Then, as shown in
FIG. 20 , thetrial ring 48 is tilted (represented by arrows and phantom lines inFIG. 20 ) with the mountinghub 18 until the desired position relative to the cut is achieved (e.g., parallel to cut). - As seen in
FIG. 21 , the mountinghub 18 is then secured in the desired position by tightening (represented by arrow inFIG. 21 ) the lockingscrew 20, e.g., with anAllen wrench 30. - As also seen in
FIG. 21 , the physician can then make amark 66 on thehumerus 38 corresponding to the position of a givenreference marker 56 on thetrial ring 48 when the mountinghub 18 is properly aligned. - For example,
FIG. 21 illustrates amark 66 made on thehumerus 38 corresponding to the position of reference marker “B” when thetrial ring 48 is properly aligned. - Next, as illustrated in
FIG. 22 , theartificial head 42 is then orientated so that the desired reference marker on theinterior surface 60 of theartificial head 42 is aligned with themark 66 previously made on thehumerus 38. - For example,
FIG. 22 illustrates the reference marker “B” on theinterior surface 60 of theartificial head 42 being aligned with themark 66 previously made on thehumerus 38. - The
artificial head 42 is then placed (represented by phantom lines inFIG. 22 ) on the mountinghub 18 in this desired orientation. - Finally, as shown in
FIG. 23 , the physician seats and secures the alignedartificial head 42 in place by hitting theartificial head 42 with ahammer 68 to lock the tapers together before placing theartificial head 42 into position within the glenoid cavity. - III. Alternate Mounting Systems
- A. Embodiment #1: Eccentric Mechanism
-
FIGS. 24 a-29 detail an alternate embodiment of a shoulderprosthesis mounting system 10C embodying features of the invention. With reference toFIGS. 24 a and 24 b, thesystem 10C comprises astem 46, apivot pin 12, a bottomeccentric insert 108, aneccentric mount 110, a topeccentric insert 112, at least onefastener 114, at least oneguidepin 116, and anartificial head 42. - The
stem 46 is a conventional stem suitable for implantation into a humerus and serves to receive thepivot pin 12. Thepivot pin 12 comprises aball component 118 and apost component 120. Thepost 120 extends from theball 118 and is sized to pass through themount 110 and aneccentric opening 122 on thebottom insert 108 to mate with thestem 46, e.g., by threaded engagement (see e.g.,FIG. 24 a) or Morse taper (not shown). - In an alternate embodiment, the
post 120 and theball 118 are not integral. Thepost 120 is integral with thestem 46 and extends from thestem 46. Theball 118 is configured to mate with thepost 120, e.g., by threaded engagement, and thus is selectively removable from thepost 120. - In either embodiment, the
stem 46 is configured to carry thepost 120 such that theball 118 protrudes at a pre-selected angle from thestem 46, e.g., 35°. Desirably, a portion of thepost 120 remains exterior to thestem 46, enabling themount 110 to pivot freely on the ball 118 (seeFIG. 29 ). - The
eccentric opening 122 is of a larger diameter than thepost 120 and sized to permit rotation of themount 110 about the x, y, and z axes, as will be described in greater detail later. - As seen in
FIG. 25 , theball 118 is a spherical member sized to rest on theeccentric opening 122 of thebottom insert 108. This arrangement allows theball 118 to serve as a pivot surface permitting adjustment of theeccentric mount 110. - The
eccentric mount 110 is a ring-like member having anouter surface 124 and aninner surface 126, as seen inFIGS. 24 a and 24 b. As best illustrated inFIG. 24 b, theinner surface 126 of themount 110 is eccentric with respect to theouter surface 124. This arrangement allows thehead 42 to be positioned eccentrally with respect to themount 110. AsFIGS. 25 and 26 show, thebottom insert 108 has anouter surface 128 adapted to mate with theinner surface 126 of the mount, e.g., by recessed slip fit that is free to rotate. - With reference again to
FIG. 26 , at least oneguidepin 116 extends from thebottom insert 108. In the illustrated embodiment, threeguidepins 116 are employed. Theguidepins 116 are adapted to pass through complementary guidepin holes 130 on thetop insert 112 when the top andbottom inserts guidepins 116 serve to help align and secure the top andbottom inserts - As best seen in
FIG. 24 b, the topeccentric insert 112 has atop surface 132 and abottom surface 134. Thebottom surface 134 has an eccentric recessedarea 136 configured to mate with theball 118. Thetop insert 112 is further adapted to rest on thebottom insert 108. - As best shown in
FIG. 26 , the bottom andtop inserts fastener opening 138 adapted for passage of afastener 114, e.g., a screw. Thefastener 114, when tightened, serves to secure themount 110 in a desired position by compressing the top andbottom inserts ball 118 and themount 110. The “stacking” arrangement of the top andbottom inserts mount 110 in a desired position. - The
eccentric mount 110 along with theeccentric opening 122 of thebottom insert 108 and the eccentric recessedarea 136 of thetop insert 112 provide a double-eccentric system. - The
artificial head 42 serves as a prosthesis for the head of a humerus, as previously described (see, e.g.,FIG. 23 ). AsFIG. 24 b shows, the recessedinterior surface 60 of thehead 42 is desirably concentric with respect to theouter surface 62 and is threaded to mate with theouter surface 124 of the mount. Placement of thehead 42 onto themount 110 secures the head to the mount 110 (seeFIG. 28 ). - The
system 10C provides at least five degrees of freedom, thereby allowing a wide range of adjustment in multiple dimensions. - First, as illustrated by arrows in
FIGS. 27 a-27 b, themount 110 can be rocked or rotated, i.e., tilted, about the x-axis (i.e., side to side rotation). - Second, as illustrated by arrows in
FIGS. 27 c-27 d, themount 110 can be rocked or rotated, i.e., tilted, about the y-axis (i.e., front to back rotation). - Third, as illustrated by arrows in
FIG. 27 e, themount 110 can be rotated up to 360° in either direction about the z-axis. - Fourth and fifth, the double eccentric arrangement permits translation of the linear position of points A1 and A2 with respect to the
pivot pin 12 when theinserts FIGS. 7 and 8 ). This action permits translation along the x and y axes. - The double-eccentric configuration serves to maximize the range of translational adjustment possible under the fourth and fifth types of movement.
- In use, as shown in
FIG. 25 , thepivot pin 12 is passed through thebottom insert 108 and themount 110. Thepivot pin 12 is then coupled to thestem 46, e.g., by screwing thepost 120 into thestem 46. AsFIG. 26 shows, thetop insert 112 is then aligned with thebottom insert 108 by aligning thefastener openings 138 on the top andbottom inserts guidepins 116 with the guidepin holes 130, and the recessedarea 136 with theball 118. - The position of the
mount 110 is then adjusted by rotating or rocking the mount about the x, y, and z axes (seeFIGS. 27 a-27 e). Thefastener 114 is then tightened to secure themount 110 in a desired position (not shown). Finally, thehead 42 is mounted onto the mount 110 (seeFIGS. 28 and 29 ). - B. Embodiment #2: Disk Slide Mechanism
-
FIGS. 30 a-34 detail another embodiment of a shoulderprosthesis mounting system 10D embodying features of the invention. With reference toFIGS. 30 a and 30 b, thesystem 10D comprises astem 46, apivot pin 12, a mountingring 140, abottom disk 142, atop disk 144, anartificial head 42, and alocking tool 146. - The stem is a
conventional stem 46 and serves to receive apivot pin 12, as previously described forsystem 10C. Thepivot pin 12 is similar in configuration to the pivot pin ofSystem 10C. Thepost 120 is adapted to pass through thebottom disk 142 and the mountingring 140 to mate with thestem 46, e.g., by threaded engagement. - As
FIG. 31 shows, theball 118 is sized to rest within thebottom disk 142. This arrangement allows theball 118 to serve as a pivot surface, thereby permitting adjustment of the mountingring 140. - As best seen in
FIG. 30 a, the mountingring 140 is comprised of anouter ring 148 having a circular marginal surface and an integrally-formed upstanding innerannular ring 150. The center of the inner ring defines achamber 152 and includes anopening 154 permitting passage of thepost 120. - With reference again to
FIG. 31 , thechamber 152 is configured to receive thebottom disk 142 and theball 118. Theouter surface 156 of theinner ring 150 is desirably configured, e.g., threaded, to mate with theinterior surface 60 of thehead 42. - In the illustrated embodiment, the
inner ring 150 is concentric with respect to theouter ring 148. However, the invention also contemplates embodiments in which theinner ring 150 is eccentric with respect to theouter ring 148. - As best seen in
FIG. 34 , the center opening 154 of the mountingring 140 is of a larger diameter than the diameter of thepost 120 and sized to permit translation of the mountingring 140 about the x and y axes and rotation about the z-axis, as will be described in greater detail later. - As seen in
FIG. 30 a, the mountingring 140 desirably has a lockingaperature 158. Theaperature 158 is a bore that transverses the circumferential margin of the mountingring 140 and serves to receive thelocking tool 146. Thelocking tool 146 is configured for insertion into the lockingaperature 158 and allows rotation of the mountingring 140 to tighten thehead 42 onto the mounting ring 140 (see alsoFIG. 34 ). - The
bottom disk 142 is a ring-like member having an open center permitting passage of thepost 120 and is configured to rest within thechamber 152 and receive the ball 118 (seeFIGS. 30 a-31). It is further configured to receive thetop disk 144, as illustrated inFIG. 32 . - Referring again to
FIGS. 30 a and 30 b, thetop disk 144 has atop surface 160 and abottom surface 162. Thetop surface 160 is desirably flat or otherwise configured to permit compression of the top andbottom disks head 42 onto the mountingring 140. Thebottom surface 162 has a recessedarea 164 configured to mate with theball 118. Thetop disk 144 is further configured to rest on the bottom disk 142 (see alsoFIG. 32 ). - This stacking arrangement permits compression of the top and
bottom disks head 42 is mounted onto the mountingring 140 and serves to maximize the surface area compressed, thereby securing the mountingring 140 in a desired position. - The
artificial head 42 serves as a prosthesis for the head of a humerus, as previously described. As seen inFIG. 30 b, the recessedinterior surface 60 of thehead 42 is desirably concentric with respect to theouter surface 62 of thehead 42. The invention also contemplates, however, embodiments in which theinterior surface 60 is eccentric. Theinterior surface 60 of thehead 42 is also desirably threaded or otherwise configured to mate with theinner ring 150 of the mountingring 140. - Similar to
system 10C, thesystem 10D provides at least five degrees of freedom. - First, as illustrated by arrows in
FIGS. 33 a-33 b, the mountingring 140 can be rocked or rotated, i.e., tilted, about the x-axis (i.e., side to side rotation). - Second, as illustrated by arrows in
FIGS. 33 c-33 d, the mountingring 140 can be rocked or rotated, i.e., tilted, about the y-axis (i.e., front to back rotation). - Third, as illustrated by arrows in
FIG. 33 e, the mountingring 140 can be rotated up to 360° in either direction about the z-axis. - The difference between the outside diameter of the top and
bottom disks chamber 152 forms a gap, as seen inFIG. 32 . This arrangement permits linear translation along the x-axis, providing a fourth degree of freedom, and the y-axis, providing a fifth degree of freedom. - In use, with reference to
FIGS. 30 a-32, thepost 120 is passed through thebottom disk 142 and the mountingring 140. Thepost 120 is then coupled to thestem 46, e.g., by screwing. Thetop disk 144 is then aligned with thebottom disk 142 by aligning the recessedarea 164 with the ball. Next, thehead 42 is mounted onto the mountingring 140. - The position of the
head 42 is then adjusted by rotating and rocking thehead 42 about the x, y, and z axes (seeFIGS. 33 a-33 e). AsFIG. 34 illustrates, thelocking tool 146 is then inserted into the lockingaperture 158. As represented by arrows inFIG. 34 , the mountingring 140 is then rotated by use of thelocking tool 146 to tighten thehead 42 onto the mountingring 140. This action places all the components in compression and fixes thehead 42 in place. - C. Embodiment #3:
- Slotted Mechanism
-
FIGS. 35 a-40 detail another embodiment of a shoulderprosthesis mounting system 10E embodying features of the invention. With reference toFIGS. 35 a and 35 b, the system comprises astem 46, a pivot pin 12), abottom plate 166, atop plate 168, at least onefastener 170, and at least onefastening element 172 for securing thefastener 170. - The
stem 46 andpivot pin 12 are configured as previously described forsystems post 120 is adapted to pass through thebottom plate 166 to mate with thestem 46, e.g., by threaded engagement. Theball 118 is sized to rest on thebottom plate 166. This arrangement allows theball 118 to serve as a pivot surface that permits adjustment of thebottom plate 166. - As shown in
FIG. 36 , thebottom plate 166 is a circular member having a major axis A1 and a minor axis A2. An elongatedeccentric slot 174 is provided along the major axis A1. Thebottom plate 166 also provides a pair ofelongated fixation slots 176 radially spaced from the center and parallel to the major axis A1. Thefixation slots 176 allow the position of thetop plate 168 to be laterally adjusted with respect to thebottom plate 166. Thefixation slots 176 also serve to receivefasteners 170, e.g., bolts, to secure the position of thetop plate 168. - As shown in
FIG. 37 , theeccentric slot 174 receives theball 118 and allows lateral, i.e., side to side, adjustment (represented by arrows and phantom lines inFIG. 37 ) of the position of theball 118 within theeccentric slot 174. - The
bottom plate 166 includes a circumferentialouter surface 178 configured to mate with thehead 42, e.g., by threaded engagement (see e.g.,FIG. 35 b). Thebottom plate 166 serves to receive thetop plate 168 in a stacked configuration. - Referring again to
FIG. 36 , thetop plate 168 is a generally elliptical member having a major axis A3 and a minor axis A4. The major axis A3 parallels the minor axis A2 of thebottom plate 166 and the minor axis A4 parallels the major axis A1 of thebottom plate 166 when thetop plate 168 is aligned withbottom plate 166. Thetop plate 168 further providesfastener receiving openings 180 sized and configured to receive thefasteners 170. - The
top plate 168 further provides atop surface 182 and abottom surface 184. Thetop surface 182 is configured to receive afastening element 172 for thefastener 170, e.g., a nut. Thebottom surface 184 includes a recessedarea 186 configured to mate with theball 118. The recessedarea 186 desirably includes anopening 188 adapted for viewing theball 118, thereby aiding in aligning thetop plate 168 with respect to thebottom plate 166. Thetop plate 168 is further configured to rest on theball 118, leaving a gap between thetop plate 168 andbottom plate 166. - The
fasteners 170, when tightened, serve to secure theplates ball 118 in a desired position by compressing the top andbottom plates plates plates ball 118. - The
artificial head 42 serves as a prosthesis for the head of a humerus, as previously described. The recessedinterior surface 60 of thehead 42 is desirably concentric with respect to theexterior surface 62 of thehead 42, as shown inFIG. 35 b. It should be understood, however, that the invention also contemplates embodiments in which theinterior surface 60 is eccentric. - Similar to
systems system 10E provides at least five degrees of freedom. - First, as illustrated by arrows in
FIGS. 39 a-39 b, thebottom plate 166 can be rocked or rotated, i.e., tilted, about the x-axis (i.e., side to side rotation). - Second, as illustrated by arrows in
FIGS. 39 c-39 d, thebottom plate 166 can be rocked or rotated, i.e., tilted, about the y-axis (i.e., front to back rotation). - Third, as illustrated by arrows in
FIG. 39 e, thebottom plate 166 can be rotated up to 360° in either direction about the z-axis. - The
slots 176 in the base 166 permit translation of the linear position of the major axis A1 and minor axis A2 with respect to thepivot pin 12 when thebottom plate 166 is slid along the x axis, providing a fourth degree of freedom, or the y axis, providing a fifth degree of freedom. - In assembling the
system 10E, thepost 120 is passed through theeccentric slot 174 of thebottom plate 166, thereby resting theball 118 within theslot 174, as seen inFIG. 37 . Thebottom plate 166 is then slid (illustrated by arrows inFIG. 37 ) along theslot 174 until the desired lateral position is obtained. Thefasteners 170 are then passed through thefixation slots 176 of thebottom plate 166. - Next, the
top plate 168 is aligned with thebottom plate 166 by aligning the recessedarea 186 with theball 118 and thefastener receiving holes 180 with thefasteners 170. Thefasteners 170 are then passed through thefixation slots 176 of thebottom plate 166 and thefastener receiving openings 180 on thetop plate 168. Thetop plate 168 is thereby positioned to rest on theball 118 and overbottom plate 166, asFIG. 38 illustrates. The position of theplates bottom plate 166 about the x, y, and z axes (seeFIGS. 39 a-39 e). - The components of the
system 10E can be provided in a fully assembled form in which the user only need tighten thefasteners 170 after adjusting the position of theplates plates - Fastening
elements 172, e.g., nuts, can be used if desired to tighten and secure thefasteners 170. This action compresses theplates ball 118 to secure theplates ball 118. - Finally, as seen in
FIG. 40 , thehead 42 is mounted onto thebottom plate 166. - The foregoing is considered as illustrative only of the principles of the invention. Furthermore, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described. While the preferred embodiment has been described, the details may be changed without departing from the invention, which is defined by the claim.
Claims (1)
1. An assembly comprising
a prosthesis;
a support;
a mount carried by the support for movement relative to an axis, the mount including a mounting surface adapted to be coupled to the prosthesis; and
a locking mechanism coupled to the mount and comprising a series of stacked washers to selectively free the mount for movement and to selectively restrain the mount against movement.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/656,285 US20070118230A1 (en) | 2001-02-27 | 2007-01-22 | Adjustable bone prostheses and related methods related applications |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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US27189501P | 2001-02-27 | 2001-02-27 | |
US10/041,722 US6736852B2 (en) | 2001-02-27 | 2002-01-08 | Adjustable bone prostheses and related methods |
US10/767,673 US7166132B2 (en) | 2001-02-27 | 2004-01-29 | Adjustable bone prostheses and related methods |
US11/656,285 US20070118230A1 (en) | 2001-02-27 | 2007-01-22 | Adjustable bone prostheses and related methods related applications |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/767,673 Division US7166132B2 (en) | 2001-02-27 | 2004-01-29 | Adjustable bone prostheses and related methods |
Publications (1)
Publication Number | Publication Date |
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US20070118230A1 true US20070118230A1 (en) | 2007-05-24 |
Family
ID=26718455
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US10/041,722 Expired - Fee Related US6736852B2 (en) | 2001-02-27 | 2002-01-08 | Adjustable bone prostheses and related methods |
US10/767,673 Expired - Fee Related US7166132B2 (en) | 2001-02-27 | 2004-01-29 | Adjustable bone prostheses and related methods |
US11/656,285 Abandoned US20070118230A1 (en) | 2001-02-27 | 2007-01-22 | Adjustable bone prostheses and related methods related applications |
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Application Number | Title | Priority Date | Filing Date |
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US10/041,722 Expired - Fee Related US6736852B2 (en) | 2001-02-27 | 2002-01-08 | Adjustable bone prostheses and related methods |
US10/767,673 Expired - Fee Related US7166132B2 (en) | 2001-02-27 | 2004-01-29 | Adjustable bone prostheses and related methods |
Country Status (6)
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US (3) | US6736852B2 (en) |
EP (1) | EP1379200B1 (en) |
AT (1) | ATE499909T1 (en) |
AU (1) | AU2002239923A1 (en) |
DE (1) | DE60239321D1 (en) |
WO (1) | WO2002067810A2 (en) |
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Also Published As
Publication number | Publication date |
---|---|
US20020120339A1 (en) | 2002-08-29 |
AU2002239923A1 (en) | 2002-09-12 |
US20040186579A1 (en) | 2004-09-23 |
US7166132B2 (en) | 2007-01-23 |
US6736852B2 (en) | 2004-05-18 |
DE60239321D1 (en) | 2011-04-14 |
WO2002067810A2 (en) | 2002-09-06 |
EP1379200B1 (en) | 2011-03-02 |
EP1379200A4 (en) | 2006-08-30 |
ATE499909T1 (en) | 2011-03-15 |
WO2002067810A3 (en) | 2003-07-17 |
EP1379200A2 (en) | 2004-01-14 |
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